The study of the vibrational dependence of H2O polarizability α is based on the comparison of experimental and calculated line shifts induced by argon, nitrogen, and air pressure in different H2O vibrational bands. The dependence of α on the internal coordinate θ, which describes large-amplitude bending vibration in the molecule, is expressed by a power series. The coefficients of the power series were selected so as to ensure the best agreement between the calculated matrix elements 〈ψn|α(θ)|ψn〉 and the polarizability values α(n) derived from the analysis of experimental H2O absorption line shifts in nν2 vibrational bands by nitrogen, oxygen, air, and argon pressure. The rotational contributions in the effective H2O polarizability are calculated and discussed. The α(θ) representation found is compared with ab initio calculations.
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The author declares that he has no conflicts of interest.
Translated by O. Ponomareva
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Starikov, V.I. Study of H2O Polarizability Based on Data on Rovibrational Line Shifts by Buffer Gas Pressure. Atmos Ocean Opt 33, 324–331 (2020). https://doi.org/10.1134/S102485602004017X